Search found 4578 matches

by Lou Jost
Mon Oct 19, 2020 6:15 pm
Forum: Equipment Discussions
Topic: Canon DSLR discounts
Replies: 9
Views: 311

Re: Canon DSLR discounts

I strongly second the move to mirrorless. No vibration, excellent live view, and no wear and tear. This week I took a hundred thousand pictures; if I had been using a DSLR, at this rate I would soon wear it out. Best of all, you can re-use all your old glass except the newer focus-by-wire and electr...
by Lou Jost
Sun Oct 18, 2020 5:35 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Indian Summer 2020
Replies: 9
Views: 793

Re: Indian Summer 2020

The spider image is great, kind of suspenseful as our attention is drawn to the big strange abdomen instead of the face. That's brilliant.
by Lou Jost
Sat Oct 17, 2020 6:54 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Flies with Olympus 22.5mm f3.5
Replies: 7
Views: 175

Re: Flies with Olympus 22.5mm f3.5

I hope you are right, that would be really useful for shooting through liquid.
by Lou Jost
Sat Oct 17, 2020 6:16 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Flies with Olympus 22.5mm f3.5
Replies: 7
Views: 175

Re: Flies with Olympus 22.5mm f3.5

optimized for looking through thick glass.
That would be very interesting and useful!
by Lou Jost
Sat Oct 17, 2020 4:17 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Flies with Olympus 22.5mm f3.5
Replies: 7
Views: 175

Re: Flies with Olympus 22.5mm f3.5

I have an almost identical Olympus 35mm f/4.5. I was not impressed with it.
by Lou Jost
Sat Oct 17, 2020 11:15 am
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

Delamination happens by use and abuse not on the shelf! I had thought that delamination is a fairly passive thing that just happens by itself to some kinds of lenses. It is common in some kinds of lenses and unheard-of in others, seemingly due to different materials used. I thought it could indeed ...
by Lou Jost
Fri Oct 16, 2020 6:08 pm
Forum: Equipment Discussions
Topic: Micro-Symmar 3.5x
Replies: 30
Views: 760

Re: Micro-Symmar 3.5x

You can get larger image circles by using medium format tube lenses. There are some good ones (Mamiya 200mm Apo for example) and maybe some superlative ones like the Hasselblad 250mm Superachromat; when released, this was said to be the best-corrected commercial lens ever. It is so well corrected th...
by Lou Jost
Fri Oct 16, 2020 3:00 pm
Forum: Equipment Discussions
Topic: Micro-Symmar 3.5x
Replies: 30
Views: 760

Re: Micro-Symmar 3.5x

The king of 3.5x still goes to the Rayfact I suppose, which needs 600mm of tubing.
Or some lens combo, which would need no extension at all....
by Lou Jost
Fri Oct 16, 2020 2:57 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

The thing that was special about that wafer was the test patterns. That's what we most need to make this useful. I hope we can find something like that again. B+W makes some, and I bought one from a forum member; maybe that is an option for some of us. What does B+W make that's relevant to the cont...
by Lou Jost
Fri Oct 16, 2020 9:52 am
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

The thing that was special about that wafer was the test patterns. That's what we most need to make this useful. I hope we can find something like that again. B+W makes some, and I bought one from a forum member; maybe that is an option for some of us.
by Lou Jost
Fri Oct 16, 2020 6:51 am
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

I think the real purpose of shared targets is not to do super-controilled experiments. It is to provide users with benchmarks to judge the quality of their setup. If a beginner knew that experts were regularly resolving x lines per mm on those resolution targets with some optic and lighting, then he...
by Lou Jost
Thu Oct 15, 2020 11:17 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

I agree, Chris, that someone just starting out can easily miss the non-optical factors that cause unsharp images. I don't think that a beginner will be able to conclude much by comparing his first result with known good results that used the same target. Too much depends on technique rather than opt...
by Lou Jost
Thu Oct 15, 2020 11:01 am
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 36
Views: 1008

Re: New Mitutoyo apo 10x

Without equipment and a known-good standard for comparison, there is no way to evaluate this lens. Many forum members are starting to get standardized wafers as resolution targets, and this will give us the ability to test and comapre our objectives against a common standard. I hope this standardiz...
by Lou Jost
Wed Oct 14, 2020 3:30 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Cluster of Bees
Replies: 3
Views: 160

Re: Cluster of Bees

What a lovely and unusual shot.
by Lou Jost
Wed Oct 14, 2020 11:34 am
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 974

Re: Can I push the resolution of a 1:1 macro lens?

Yes, it is there now. Maybe my computer was drawing from its cache.